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You (or your clients) can use Trello on IE8 after installing the Google Chrome Frame.
In fact, if you attempt to use Trello with IE8, you'll get a message that gives you that advice:
Your browser is not supported.
Trello supports Chrome 9 and above, Firefox 4 and above, Safari 5.0.5
and above, and Internet Explorer 9 and above.
Internet ...

From http://answers.microsoft.com/en-us/ie/forum/ie9-windows_7/how-to-set-default-language-for/193f8aee-dae0-44c9-9c75-11a7e0e49da4:
Go to http://support.microsoft.com and look at the very bottom left-hand corner of the page. There you will see a globe icon with the current region and language. Click that and choose your desired region/language. This change ...

What you should be looking for is a HTML5 Internet speed test. No add-ons/plugins (Flash/Java) are required when it comes to HTML5, and it should work well on both desktop and mobile devices.
Here are 4 HTML5 Internet speed test websites I have found:
HTML5SpeedTest.me
SpeedOf.Me
testmy.net
BandwidthPlace.com

First, you have to go to https://www.google.com/accounts/ and enable multiple sign ins.
Then, click on your account name in the top right. There should be a button saying "Sign in with another account...", which lets you do exactly what you're asking.

This document explains how to do this.
Edit: Here's the key instructions copied from that location:
I have a couple different Gmail addresses that I use for different
purposes. Historically, Google Accounts – including Gmail accounts —
have only let people access one account at a time per browser, so
using both accounts has been a bit ...

From: "John Greet (GitHub Staff)"
Are you signed in to GitHub in Internet Explorer?
SSH access requires a GitHub account with a public key associated with it, even
for public repositories, so we don't show the SSH remote in any browser if you
are logged out.

Visit Google Accounts and click the link next to "Multiple sign-in." After you sign into your first account, you can sign in with up to two additional accounts from the new accounts menu in the upper right hand corner of Gmail, then easily toggle back and forth between them. You can even open multiple Gmail tabs — one for each of your accounts.

Can someone tell me why? Because you used different web browsers.
Google, is an advertising company, a pretty big and successful one. So, it's not surprising that one component in deciding what search results are most relevant to you is what browser you're using.
From that information, they can infer generalizations about you and thus attempt to show you ...